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The Rarefied blog

Field notes on offensive security, application and API testing, and building software that stands up to attack.

Cyber Due Diligence for Private Equity: Protecting the Whole Portfolio

Most private equity firms treat cyber diligence as a checkbox in the pre-close workstream — a questionnaire, a policy review,...

Sep 15, 20265 min

Penetration Testing Kubernetes and Cloud-Native Environments

A traditional network penetration test asks a simple question: what can I reach, and what can I do once I get there? That question...

Sep 08, 20264 min

Shadow APIs and API Sprawl: Your Biggest Blind Spot in 2026

Ask a security team how many APIs their company runs and you will usually get a number. Ask engineering the same question and you...

Sep 01, 20265 min

AI-Powered Social Engineering: When Phishing Learns to Think

For twenty years, phishing defense leaned on a quiet assumption: the attacker would make a mistake you could see. Bad grammar, a...

Aug 25, 20265 min

Non-Human Identities and Secrets Sprawl: Securing the New Perimeter

Your identity program probably has a good story for humans. People get onboarded, assigned roles, reviewed quarterly, and...

Aug 18, 20265 min

Harvest Now, Decrypt Later: Getting Ahead of the Post-Quantum Threat

Encryption buys you time, not permanence. That distinction rarely matters, because most stolen data loses its value long before...

Aug 11, 20264 min

Software Supply Chain Attacks: What Your Penetration Test Must Now Cover

Most of the code running in your production environment was not written by your team. A typical service pulls in a handful of...

Aug 04, 20265 min

Why Annual Penetration Tests Are No Longer Enough

The annual penetration test is a ritual most engineering organizations inherited without examining. Once a year, a team arrives,...

Jul 28, 20265 min

Securing Autonomous AI Agents: The Next Frontier in Application Security

For the last few years, the security conversation around large language models has been about what the model says. Can it be...

Jul 21, 20265 min